1 Merlin: So, what I don't understand is you sat in the Siege Perilous, yet you still live.
1 Prof. Jones: What's the problem?
2 Merlin: I enchanted it myself! It slays all except the one destined to find the Holy Grail!
3 Prof. Jones: Oh, is that all? I found that years ago.
4 Merlin: Oh? Phew, I thought maybe my spell was a botch job.